Chemistry questions, ask the master to answer in detail, chemistry questions urgently need to be ans

1) B>A>C Sulfuric acid is a dibasic strong acid, and hydrochloric acid is a monobasic strong acid, so the concentration of hydrogen ions in sulfuric acid is twice that of hydrochloric acid, and acetic acid is a monobasic weak acid, partially ionized, so the concentration of hydrogen ions is smaller than that in hydrochloric acid.

2) The three quantities of b>a=c and other substances are calculated to neutralize the sodium hydroxide solution, only need to look at the total number of hydrogen atoms, do not care about whether it is completely ionized, the number of hydrogen atoms in sulfuric acid is twice that of hydrochloric acid and acetic acid.

3) C>A>B Acetic acid is a single weak acid, and hydrochloric acid is a strong acid, so the concentration of acetic acid is greater than that of hydrochloric acid, and disulfuric acid is a dibasic strong acid, so the concentration of sulfuric acid is less than that of hydrochloric acid.

4) C>A=B Because Zn is sufficient to replace all the hydrogen in the acid, the hydrogen produced by sulfuric acid and hydrochloric acid is equal (because the amount of hydrogen ion substances is equal and completely ionized), and the hydrogen ions ionized by acetic acid are only a small part, and as the reaction progresses, it continues to be ionized, so the final amount of hydrogen produced will be greater than that produced by hydrochloric acid and sulfuric acid.

5) a=b=c At the beginning, the magnitude of the reaction rate is only related to the concentration of hydrogen ions in the solution at the beginning state, and from the title, the concentration of hydrogen ions in the three acids is completely equal, so the rates of the three are equal.

6) a=b>c Because hydrochloric acid and sulfuric acid are completely ionized, as the reaction progresses, the hydrogen ions are consumed, the concentration decreases and always remains equal, so the time required for the two is equal, and acetic acid can continue to ionize hydrogen ions during the reaction process to maintain its concentration, so that it is reduced less than the other two, so it takes less time than sulfuric acid and hydrochloric acid.

7) C>a=b Sulfuric acid and hydrochloric acid have been completely ionized, and there will be no hydrogen ion supplement when diluted with water, so the final concentration is one percent of the original concentration, and the acetic acid continues to ionize hydrogen ions when diluted with water, and the concentration becomes larger, greater than one percent of the original concentration.

Arranged by pH equivalent and number of h particles.

1)b>a>c.Assuming that the concentration of various acids is 1mol L, the ionization degree of CH3COOH is treated as 1%. The hydrogen ion concentration of each solution can be compared.

2)b>a=c.The amount of neutralized sodium hydroxide has nothing to do with strong acids and weak acids, but only with the amount of substance.

3)c>a>b.Let the concentration of hydrogen ions in each acid be 1mol l, and the concentration of each acid can be compared.

4)c>a=b.The amount of hydrogen produced is not related to strong acids and weak acids, but only to the amount of substances.

5)c=a=b.The reaction rate at the beginning of the reaction is related to the concentration of hydrogen ions at the moment of initiation. The concentration of hydrogen ions is equal and the starting rate is equal.

6)a=b>c.Since acetic acid is a weak acid, as the reaction progresses, the acetic acid ionization equilibrium shifts in a positive direction, and the time required for the reaction to complete is the shortest.

7)c>a=b.Since acetic acid is a weak acid, the dilution process also promotes the positive shift of ionization equilibrium, so the concentration of hydrogen ions in diluted acetic acid is the highest.

Zn+ 2HCl=ZnCl2+H2 65(relative mass) 2 1(mol).

y xx = so the volume is.

2)y=100ml=

First analyze the topic: this reaction happens to be a complete reaction, indicating that the least zinc reaction is complete.

zn+2hcl=zncl2+h2

It can be seen that the generated h2 is also , ie.

2 (c* gets: c=2mol l

Zinc is Zn+2HCl=ZnCl2+H2

1 2 1 So the hydrogen produced is liters.

Hydrochloric acid is in 100ml, so it is 2mol l

Wrong. The mass fraction is the solute mass of the solution. Not solute quality Solvent quality.

The mass score should be 110 (110+100) *100% = %.

No, he's confusing the concept ... Solute mass fraction = solute mass solution mass, and he uses solute mass solvent mass... So it's not true.

Wrong. The mass fraction of the solute is the ratio of the mass of the solute to the mass of the solution.

Solubility is the maximum amount of dissolved solute in 100 grams of solvent!

No, because the concepts of solute mass fraction and solubility are two different and should not be confused.

1) This problem is a typical calculation problem of the difference method.

n (decrease) = n (SO2 + O2) - n (equilibrium) = 4 + let the amount of SO2 consumed in the reaction process be x

2so2(g)+o2(g)=2so3(g)nx

x=So SO2 is still left in equilibrium.

2) Because the volume fraction of the gas is the same after the two feeding equilibrations, Tempe knows that this is an equivalent equilibrium problem.

Because the condition is constant temperature and pressure, it can be seen that as long as the corresponding amount of the product is converted into reactants, it can be proportional.

That is, (:( from this equation allows the waiter to see that no matter what value x takes, the equation is always true, then x>=0

Analysis: (1) It can be translated with sodium bicarbonate, indicating that there is a carboxyl-COOH (2) and a chromogenic reaction with ferric chloride solution 2, indicating that there is a phenolic hydroxyl group (that is, the benzene ring is directly connected to a hydroxyl group).

3) It can fade the carbon tetrachloride solution of bromine, indicating that an addition reaction can occur, that is, there are carbon-carbon double or triple bonds.

4) Oxidation of potassium permanganate to obtain paraben.

In summary, it can be seen that the organic matter is ho-benzene ring-ch=ch-cooh

P-hydroxyphenylacrylic acid, wrong to change, let's go.